The material this drawer is made of is just too thin. I meassured it, and it is around 1,4mm thick (and that is with the paint). I tightened the rack screws, and the rack ears bent a little against the racknut.
Make sure you mount the drawer in a level place. If it is not locked with a key there is nothing actually holding it closed. I doesn't latch or clip in the closed position.
Because of the very thin material this is made of, I would not bring it on the road with me. Luckily mine is only for storing mics at my warehouse.